package com.zgh.zhongcan.config;

import com.zgh.zhongcan.common.JacksonObjectMapper;
import lombok.extern.slf4j.Slf4j;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.converter.HttpMessageConverter;
import org.springframework.http.converter.json.MappingJackson2HttpMessageConverter;
import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistration;
import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurationSupport;

import java.util.List;

/**
 * @author 时侍
 * @version 1.0
 **/

@Slf4j
@Configuration
public class WebMvcConfig extends WebMvcConfigurationSupport {
    /**
     * 设置静态资源映射
     * @param registry
     */
    @Override
    protected void addResourceHandlers(ResourceHandlerRegistry registry){
        log.info("开启映射");
        //所有 /backend/ 开头的请求都会去后面配置的路径下查找资源
        //addResourceLocations后面的路径要以 / 结尾啊，不然会拼接到文件名的前面
        registry.addResourceHandler("/backend/**").addResourceLocations("classpath:/backend/");
        registry.addResourceHandler("/front/**").addResourceLocations("classpath:/front/");
    }

    /**
     * 扩展mvc框架的消息转换器
     */
    protected void extendMessageConverters(List<HttpMessageConverter<?>> converters){
        //创建消息转换器对象
        MappingJackson2HttpMessageConverter messageConverter = new MappingJackson2HttpMessageConverter();
        //设置对象转换器，底层用jackson将java对象转为json
        messageConverter.setObjectMapper(new JacksonObjectMapper());
        //将转换器对象追加到mvc框架的转换器集合中
        converters.add(0,messageConverter);//转换器是有顺序的，设置下标为0，让自定义的转换器优先执行
    }
}
